记事本如何使用正则

Enable regex mode in Notepad++ by opening Find (Ctrl+F) or Replace (Ctrl+H), then selecting "Regular expression" under Search Mode and optionally enabling ". matches newline". 2. Use regex for common tasks: to replace numbers with brackets, use Find what: (\d+) and Replace with: [$1]; to remove empty lines, use Find what: ^\s*$\r?\n and Replace with nothing; to add a prefix like // to every line, use Find what: ^(.)$ and Replace with: // $1; to add a suffix like ;, use Replace with: $1; to remove text after a comma, use Find what: ,.*$; to keep text after the first space, use Find what: ^1\ and Replace with nothing; to find emails, use \b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+.[A-Za-z]{2,}\b; to find lines starting with a number, use ^\d+.*$; to find "error" case-insensitively, use (?i)error. 3. Apply tips: use capture groups with () and reference them via $1, $2, etc., escape special characters like . with ., use the Boost engine’s features, and test patterns on small samples before large-scale use. Regex in Notepad++ is effective for batch editing logs, code, CSVs, and text cleanup when used correctly. ↩

Using regex (regular expressions) in Notepad++ is a powerful way to search, replace, and manipulate text. Here’s how to use it effectively.

Enable Regex Mode in Notepad++

When using the Find or Replace feature, make sure to select the correct search mode:

• Open Find (Ctrl + F) or Replace (Ctrl + H)
• At the bottom of the dialog, locate Search Mode
• Select "Regular expression"
• Optionally check ". matches newline" if you want the dot to match line breaks

Without selecting "Regular expression", your patterns will be treated as plain text.

Common Regex Tasks in Notepad++

1. Find and Replace Text Patterns

Regex lets you match patterns instead of fixed strings.

Example: Replace all numbers with brackets around them

• Find what: (\d+)
• Replace with: [$1]
• This turns 123 into [123]

\d+ matches one or more digits
Parentheses () capture the value so you can reuse it with $1

2. Remove Empty Lines

To delete blank lines (including lines with only spaces or tabs):

• Find what: ^\s*$\r?\n
• Replace with: (leave empty)
• Make sure "Regular expression" is selected

^ = start of line
\s* = any whitespace (spaces, tabs)
$ = end of line
\r?\n = newline (works on Windows and Unix)

You can also use . matches newline off for this.

3. Add Prefix or Suffix to Every Line

Add // at the start of each line:

• Find what: ^(.*)$
• Replace with: // $1

Add a semicolon at the end of each line:

• Find what: ^(.*)$
• Replace with: $1;

^.*$ matches the entire line
$1 refers to whatever was matched inside (.*)

4. Extract or Remove Parts of Lines

Remove everything after a comma on each line:

• Find what: ,.*$
• Replace with: (empty)
• Result: apple,banana,cherry → apple

Keep only text after the first space:

• Find what: ^[^ ]*
• Replace with: (empty)
• This removes the first word and the space

5. Match Specific Patterns

Find email-like strings:

• Find what: \b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,}\b
• This is a basic email pattern

Find lines starting with a number:

• Find what: ^\d+.*$

Find lines containing "error" (case insensitive):

• Use (?i) flag: (?i)error

Useful Regex Tips in Notepad++

• Use Alt + C in Replace dialog for column mode, useful with regex results
• Capture groups with () and reference with $1, $2, etc.
• Notepad++ uses the Boost regex engine, which supports most common regex features
• To match a literal dot, use \. — otherwise . means "any character"
• To replace across multiple files, use "Find in Files" tab with regex enabled

Common Metacharacters

Basically, regex in Notepad++ is great for batch editing logs, code, CSVs, or cleaning up text. Start with simple patterns and build up. Test on a small sample first.

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